package com.example.lanqiaodemo1;

import java.io.*;

public class  A{

   public static void main(String[] args)throws Exception {
      char[] chars=null;
      FileWriter fileWriter=null;
      fileWriter.write("jjjjjjj");
      fileWriter.write(chars);
   }
}

//class  ClassB extends A{
//
//   private  double b;
//
//   public ClassB(double  a,double  b){
//      super.setA(a);
//      this.b=b;
//   }
//
//}
